8. The Geographical Grid- Latitude and Longitude

The earth’s surface is so vast that unless a mathematical method can be used, it is impossible to locate any place on it. For this reason, imaginary lines have been drawn on the globe. One set running east and west, parallel to the equator, are called lines of latitude. The other set runs north and south passing through the poles and are called lines of longitude. The intersection of latitude and longitude pin-points any place on the earth’s surface. For example Delhi is 28°37’N and 77°10’E.